Nominal scale

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Nominal scale - type of measuring scale. Variables are on a nominal scale when they take values ​​(labels) for which there is no ordering of the nature of the given order.

Even if the values ​​of the nominal variable are expressed numerically, these numbers are only contractual identifiers, so you can not perform arithmetic operations on them or compare them.

Examples of nominal variables: county of residence, sex.

Examples of non-nominal variables: car speed, age

A special case of the nominal scale is the dichotomous scale, where there are only two possible values ​​of the variable (eg sex, answers to yes / no questions). Permissible statistical operations

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